When you say that the mic is only a single channel, you mean that it's mono only because you're only connecting one of the RCA cables (red or white) to it and not both, right?

All you'd need, I think, is an RCA-to-mini-plug cord - something like this: http://www.amazon.com/3-5mm-Mini-Plu.../dp/B000FEHO0U

Or if your RCA cable is permanently connected to your recorder, the female version: http://www.amazon.com/gp/product/B00...d_i=B000FEHO0U